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Finding the Fourth Proportional to 318,881.21, 478,380.67 and 131,907.29

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Solution

The fourth proportional to 318,881.21, 478,380.67 and 131,907.29 is: 197,885.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,881.21 : 478,380.67 = 131,907.29 : x
  2. Step 2: Convert to fraction form
    318,881.21/478,380.67 = 131,907.29/x
  3. Step 3: Cross multiply
    318,881.21x = 478,380.67 × 131,907.29
  4. Step 4: Simplify right side
    318,881.21x = 63,101,895,046.41
  5. Step 5: Solve for x
    x = 63,101,895,046.41/318,881.21
  6. Step 6: Final answer
    x = 197,885.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.